CN1771362B - Fibrous sheet, method for producing the same, and absorbent article containing the same - Google Patents

Abstract

A fibrous sheet comprising cotton fibers and two or more synthetic fibers is disclosed. The synthetic fibers form a nonwoven fabric. The cotton fibers are inserted into the fiber network of the nonwoven fabric and are entangled with the fiber network, and a cotton fiber layer is formed on one surface of the nonwoven fabric in a state of being partially inserted into the nonwoven fabric. The synthetic fiber comprises a) a combination of fibers and b) fibers or a combination of a) fibers and c) fibers, a) melt-bondable fibers, b) a heat-fusible fiber having a smaller fiber diameter than the heat-fusible fiber of a), and c) fibers which are not melt-bonded to the heat-fusible fiber of a).

Description

Fibrous sheet, method for producing the same, and absorbent article containing the same

technical field

The present invention relates to a fiber sheet having a cotton fiber layer on at least one side and a method for producing the same. The fibrous sheet of the present invention is particularly suitable for use as a sheet that contacts the skin. the

Background technique

There is known a pressure patch material for absorbing bodily fluids that has a soft non-woven surface material made of cotton fibers (see Japanese Patent Application Laid-Open No. 8-24289). This surface material is produced by hydrodynamic interlacing. Therefore, this surface material forms a structure in which the distance between fibers is small and the mesh is clogged, and the feel becomes hard. Therefore, it lacks flexibility when used as a surface material that contacts the skin. As a means of improving softness, it is conceivable to reduce the mass per unit area of the surface material, but since this surface material is composed of cotton fibers alone, it is difficult to reduce the mass per unit area. It is considered that the lower limit value is about 35 to 40 g/m ² even if an attempt is made to reduce the mass per unit area. Furthermore, since this surface material maintains the sheet shape only by the interweaving of cotton fibers, it is difficult to sufficiently improve mechanical strength such as tensile strength. Increasing strength and reducing mass per unit area are generally inverse relationships.

There is a method of compounding natural fibers such as cotton fibers with other fibers to reduce the mass per unit area of cotton fibers (with reference to Japanese Patent Laying-Open No. 60-199962). According to this method, a fiber web of short fibers such as natural fibers is laminated on the upper surface of a mesh sheet, and the fibers of the fiber web are interwoven with each other and also with the mesh sheet by high-speed water treatment. However, since the interweaving object of the short fibers is a mesh sheet, the interwoven short fibers may cause blockage of the mesh and shorten the distance between fibers. As a result, the resulting sheet was stiff and lacked flexibility. the

Contents of the invention

The present invention provides a fibrous sheet comprising cotton fibers and two or more different synthetic fibers. Two or more of the foregoing synthetic fibers form a nonwoven fabric. Cotton fibers enter the fiber network of the nonwoven fabric and are interwoven with the fiber network, and a cotton fiber layer is formed on one side of the nonwoven fabric in a state of partially entering the nonwoven fabric. Two or more of the aforementioned synthetic fibers comprise a combination of a) fibers and b) fibers or a combination of a) fibers and c) fibers,

a) heat-melt adhesive fibers,

b) heat-melt-adhesive fibers having a smaller fiber diameter than the heat-melt-adhesive fibers of a),

c) Fibers that are not fusion-bonded with the heat-melt-adhesive fibers of a). the

In addition, as a preferable manufacturing method of the aforementioned fibrous sheet, the present invention provides the following manufacturing method in which cotton is laminated on one side of a nonwoven fabric containing a) fiber and b) fiber or a) fiber and c) fiber A fiber web of fibers, spraying high-pressure water from the side of the fiber web, making the cotton fibers enter the fiber network of the non-woven fabric, and interweaving it with the fiber network, and at the same time making the b) fibers or c in the non-woven fabric ) fibers move to the other side of the nonwoven fabric. the

Furthermore, the present invention provides a fibrous sheet comprising cotton fibers and two or more different synthetic fibers. Two or more of the foregoing synthetic fibers form a nonwoven fabric. Cotton fibers enter the fiber network of the nonwoven fabric and are interwoven with the fiber network, and cotton fiber layers are formed on each side of the nonwoven fabric in a state of partially entering the nonwoven fabric. Two or more of the aforementioned synthetic fibers comprise a combination of a) fibers and b) fibers or a combination of a) fibers and c) fibers,

a) heat-melt adhesive fibers,

b) heat-melt-adhesive fibers having a smaller fiber diameter than the heat-melt-adhesive fibers of a),

c) Fibers that are not fusion-bonded with the heat-melt-adhesive fibers of a). the

Furthermore, the present invention provides an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent body disposed between the two sheets. , wherein any one of the aforementioned fiber sheets is used as the front sheet. the

Description of drawings

Fig. 1 is a schematic diagram showing a longitudinal cross-sectional structure of one embodiment of the fibrous sheet of the present invention. the

Fig. 2 is a view showing a process of manufacturing the fibrous sheet shown in Fig. 1 . the

Fig. 3 is a schematic view showing a state in which a fiber web of cotton fibers is interwoven with a nonwoven fabric. the

Fig. 4 is a schematic view showing a longitudinal cross-sectional structure of another embodiment of the fibrous sheet of the present invention. the

Detailed ways

The present invention relates to a fibrous sheet containing cotton fibers, which has high strength and soft touch, and a method for producing the same. the

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. Fig. 1 is a schematic view showing a longitudinal sectional structure of one embodiment of the fibrous sheet of the present invention. The fiber sheet 1 is composed of a composite sheet formed by partially entering a cotton fiber layer 3 into one side of a nonwoven fabric 2 made of synthetic fibers. the

The cotton fiber 4 enters into the fiber network of the nonwoven fabric 2 , and the cotton fiber layer 4 is interwoven with the fiber network, so that the cotton fiber layer 3 is formed on one side of the nonwoven fabric 2 . Of course, the cotton fibers 4 are also intertwined with each other. As shown in FIG. 1 , in the fibrous sheet 1 , the amount of cotton fibers gradually decreases from the side where the cotton fiber layer 3 is formed to the side where the cotton fiber layer 3 is not formed. the

On the other hand, the nonwoven fabric 2 is composed of two or more kinds of synthetic fibers, providing a network structure interwoven with cotton fibers 4 . Synthetic fibers comprising the following combinations of a) fibers and b) fibers or a) fibers and c) fibers,

a) heat-melt adhesive fibers,

b) heat-melt-adhesive fibers having a smaller fiber diameter than the heat-melt-adhesive fibers of a),

c) Fibers that are not fusion-bonded with the heat-melt-adhesive fibers of a). the

a) The purpose of using the fibers is to form the main fiber network on the non-woven fabric 2 . Therefore, the fibers of a) are referred to below as network-forming fibers. From the viewpoint of forming a stable and reliable fiber network, the fiber diameter of the network-forming fibers is preferably relatively thick. Specifically, 3 to 16 dtex is preferred, and 4 to 10 dtex is particularly preferred. For the same reason, the network-forming fibers are preferably made of a highly rigid synthetic resin. For example, it is preferably composed of a conjugate fiber containing polypropylene, polyester, etc. as a rigid component, and polyethylene, low-melting point polyester, etc. as a fusion bonding component. the

On the other hand, the purpose of using b) and c) fibers is to expand the fiber space of the fiber network when the cotton fibers 4 constituting the cotton fiber layer 3 are interwoven in the fiber network of the non-woven fabric 2 (details of this point) described later). Therefore, the fibers b) and c) are collectively referred to as fiber space expanding fibers below. the

b) As the fibers, fibers having a smaller fiber diameter than the network-forming fibers are used. Specifically, from the perspective of expanding the fiber space of the fiber network, b) the fineness (dtex) of the fibers is preferably 5-80% smaller than the fineness (dtex) of the network-forming fibers, particularly preferably about 10-50% smaller . b) A part of the fibers is melt-bonded with the network-forming fibers in the nonwoven fabric 2 . the

c) Fibers used are fibers that are not fusion-bonded with network-forming fibers. The so-called "fibers that are not fusion-bonded with network-forming fibers" include the following two types of fibers: fibers that cannot be fusion-bonded with network-forming fibers because they do not have fusion-bondability inherently; The nonwoven fabric 2 is not fusion-bonded with the network-forming fibers during the production process, and as a result, the fibers are in a state where they are not fusion-bonded with the network-forming fibers. c) The fiber is different from the b) fiber mentioned above, and there is no special requirement on the size relationship with the diameter of the network-forming fiber. As c) fibers, fibers made of a synthetic resin having a melting point higher than that of the synthetic resin constituting network-forming fibers, for example, a single fiber made of synthetic resins such as polyester, polypropylene, ethylene-propylene copolymer, polyamide, etc. Fibers, and side-by-side composite fibers or core-sheath composite fibers composed of a combination of two or more of the synthetic resins (such fibers are generally heat-melt-adhesive), and those that do not originally have heat-melt bonding Sexual fibers, such as rayon, etc. Particularly preferred as c) fibers are latently crimped fibers in which crimps have developed. The advantage of using such fibers is that there is less fiber shedding, and stretchability appears on the fiber sheet 1, so that the fiber sheet 1 can be obtained with good softness and touch, and excellent usability. Another advantage is that if the curl of latent crimping fibers occurs after the fiber web formed in the production process of the nonwoven fabric 2 is formed, it is easy to entangle with the network forming fibers when forming a fiber web such as carding. After the crimped latently crimped fibers are entangled with the network-forming fibers, fiber shedding is less likely to occur when the high-pressure water jet is sprayed during the production process of the fibrous sheet 1 (described later). Furthermore, due to the water flow pressure, the coil portion of the crimped potentially crimped fiber is elongated and separated, or the weakly wound part falls off, and the expansion of the fiber space of the fiber network can be properly controlled. the

The fibrous sheet shown in FIG. 1 uses two types of synthetic fibers, network-forming fibers I and a fiber space-expanding fiber II. Of course, two or more kinds of fiber space expanding fibers II can also be used. For example, b) fiber and c) fiber can be used together. In addition, in FIG. 1, in order to emphasize the bulky fiber network formed by the network-forming fibers I, the network-forming fibers I are schematically shown as vertically long ellipses. the

As shown in FIG. 1, the fiber space expanding fibers II are unevenly distributed on the side opposite to the side where the cotton fiber layer 3 is formed. Because of this non-uniform distribution, when the cotton fibers 4 constituting the cotton fiber layer 3 are interwoven in the fiber network of the non-woven fabric 2, the fiber space of the fiber network will be enlarged (described later about this point). the

The fibrous sheet 1 of the present embodiment mainly achieves the following advantageous effects (a) to (c) by having the above structure. the

(a) In the cotton fiber layer 3, the interfiber distance between the cotton fibers 4 constituting the cotton fiber layer 3 is increased, thereby preventing the clogging of the cotton fibers 4 that tends to occur in conventional cotton sheets. As a result, the cotton fiber layer 3 exhibits soft texture. Softness is specifically that the cotton fiber layer 3 is compared with the cotton sheet (all cotton sheets manufactured under the condition of enlarging the distance between fibers as much as possible) obtained after using the same kind of cotton fiber by water flow. increased. The flexibility of the fiber sheet 1 can be evaluated by the following method. the

The evaluation of the flexibility of the fiber sheet 1 was performed using a KES compression tester (KES-FB3, manufactured by KATO TECH). From the point of view of improved flexibility (cushioning) without fiber mesh clogging, the initial thickness at the time of evaluation is T ₀ when the maximum load value measured by the aforementioned device is 49cN/cm ² (50gf/cm ² ). (Thickness under a load of 0.5 gf/cm ² ) and the thickness at the maximum load are T, and the value calculated by the formula (T ₀ -T)/T ₀ is preferably 0.5 to 0.9.

(b) Because the cotton fiber 4 enters the inside of the nonwoven fabric 2, the fiber amount of the fiber sheet 1 gradually increases from the side where the cotton fiber layer is formed to the center in the thickness direction of the fiber sheet 1 as a whole. That is, the distance between fibers gradually decreases from the side where the cotton fiber layer is formed toward the center in the thickness direction of the fiber sheet 1 . As a result, the capillary force gradually increases from the side where the cotton fiber layer is formed toward the center in the thickness direction of the fiber sheet 1 . That is, the capillary force creates a gradient. Therefore, the liquid absorption from the side where the cotton fiber layer is formed to the inside of the sheet is improved, and even if the fibrous sheet 1 comes into contact with liquid, the surface on the side where the cotton fiber layer is formed will feel dry. When conventional cotton sheets come into contact with liquid, the surface feels wet due to the unique water absorption and hygroscopicity of cotton, but the fiber sheet of the present invention does not have such a disadvantage. the

(c) Since the cotton fiber layer 3 is in the state of partially entering the non-woven fabric 2, compared with a cotton sheet composed of cotton fibers of the same unit area mass alone, the mechanical properties of the cotton fiber layer 3 headed by tensile strength Increased strength. This is especially advantageous when the cotton fiber layer 3 has a low basis weight. Because reducing the mass per unit area of the cotton fiber layer 3 can help to improve the softness of the cotton fiber layer 3 . the

In the nonwoven fabric 2, from the viewpoint that the mechanical strength such as the tensile strength of the nonwoven fabric 2 can be sufficiently improved, and the network can be maintained sufficiently, it is preferable to contain 30 to 70% by mass of network-forming fibers, particularly preferably 40 to 60%. % by mass, and preferably 70 to 30% by mass of fiber space-expanding fibers, particularly preferably 60 to 40% by mass. It is also desirable from the point that cotton fibers will easily enter the nonwoven fabric 2 . The nonwoven fabric 2 may contain other fibers in addition to the network-forming fibers I and the fiber space-expanding fibers II. Examples of those fibers include split-type composite fibers made of synthetic resins such as polyester, polypropylene, ethylene-propylene copolymer, and polyamide, rayon, pulp, and other fibers that can enhance the capillary force of the nonwoven fabric 2. . The capillary force depends on factors such as the space diameter and hydrophilicity of the nonwoven fabric 2 . the

The cotton fiber layer 3 is made of cotton fibers commonly used in the art. The cotton fiber layer 3 may consist of cotton fibers alone, or may contain a small amount of other fibers. Examples of such fibers include rayon fibers, pulp fibers, heat-melt adhesive fibers, and the like. the

From the perspective of fully forming a fiber network that interweaves cotton fibers 4 and ensuring the overall strength of the fiber sheet 1, the weight per unit area of the non-woven fabric 2 in the fiber sheet 1 is preferably 15 to 80 g/m ² , Particularly preferably, it is 25 to 60 g/m ² . On the other hand, in consideration of securing sufficient softness and reducing manufacturing costs, the mass per unit area of the cotton fiber layer 3 is preferably 5 to 30 g/m ² , particularly preferably 10 to 20 g/m ² . In view of usability and hand feeling, the mass per unit area of the entire fibrous sheet 1 is preferably 25-100 g/m ² , particularly preferably 35-80 g/m ² .

The fibrous sheet 1 is very suitable for use in contact with the skin, for example, as a front sheet of an absorbent article, a cleansing sheet, a towel, a wet cleaning sheet, a dishwashing sheet, and the like. In addition, when used in contact with human skin, the fiber sheet 1 is used so that the cotton fiber layer 3 side thereof contacts the skin. the

For example, when the fibrous sheet 1 is used as the front sheet of an absorbent article, the absorbent article consists of the fibrous sheet 1 as the front sheet, a liquid-impermeable back sheet, and an intervening sheet between these two sheets. It is composed of a liquid-retaining absorbent body arranged between them. The front sheet is the side facing the wearer's skin, and the back sheet is the side facing the garment. As the back sheet, films of various thermoplastic resins or laminates of such films and nonwoven fabrics can be used. As the absorber, a fiber aggregate of a superabsorbent polymer and fluff pulp, paper containing a superabsorbent polymer, or the like can be used. Absorbent articles of such a configuration include, for example, sanitary napkins, panty liners, incontinence pads, disposable diapers, and the like. When the fiber sheet 1 is used for such an application, it is installed in an absorbent article so that the side of the cotton fiber layer 3 faces the user's body as described above. The absorbent article using the fibrous sheet 1 as the top sheet is comfortable to wear due to the soft texture of the fibrous sheet 1 . In addition, since the fibrous sheet 1 has high liquid absorbency, the skin-facing side of the absorbent article remains dry, which is also the reason why the wearing feeling of the absorbent article is good. the

Next, a preferred method of manufacturing the fibrous sheet 1 shown in FIG. 1 will be described. First, a nonwoven fabric 2 is produced. The nonwoven fabric 2 can be produced according to a normal nonwoven fabric production method. Particularly preferred methods of manufacture are through-air and airlaid methods, which result in the formation of a bulky fiber network. For example, when the nonwoven fabric 2 is produced by the air-through method, the raw material fibers mixed with the network-forming fibers and the fiber space-expanding fibers in a predetermined ratio are opened by a carding machine to produce a fiber web. Then, the hot air heated to a predetermined temperature is blown onto the fiber web to melt and bond the intersection points of the fibers. In this case, when b) is used as the fiber space-expanding fibers, the network-forming fibers, the fiber-space-expanding fibers, and the network-forming fibers and the fiber space-expanding fibers are fused and bonded. On the other hand, when the c) fiber is used as the fiber space expanding fiber, the network-forming fibers are melt-bonded. In this way, a nonwoven fabric 2 can be obtained. c) When latently crimpable fibers are used as fibers, after the hot air is blown, the non-woven fabric 2 is heated above the temperature at which the latently crimpable fibers are crimped, so that the latently crimpable fibers are curled into a coil shape. By this crimping, a part of the network forming fiber enters into the coil of the crimped latent crimping fiber. In the nonwoven fabric 2 produced in this way, the network-forming fibers and the fiber space-expanding fibers are each uniformly distributed. That is, there is no uneven distribution of individual fibers. the

In addition to the production of the nonwoven 2, a cotton fiber web is also produced. The fiber web is obtained by opening cotton fibers with a carding machine. the

The resulting web of cotton fibers was superimposed on the nonwoven fabric 2 . This state is shown in Figure 2. In Fig. 2, the nonwoven fabric 2 is rolled out from the gray fabric 2' and conveyed by an endless conveyor belt 5 composed of a wire mesh. On the conveyed nonwoven fabric 2, the fibrous web 3' of cotton fibers is superimposed. Under the overlapping state of the two, spray high-pressure water flow with nozzle 6 from the fiber web 3 ' side of cotton fiber. Fig. 3 schematically shows this state. the

As shown in Figure 3, in the fiber web 3' of cotton fibers superimposed on the non-woven fabric 2 by the injection of high-pressure water flow, the cotton fibers 4 are interlaced, and the constituent fibers of the cotton fibers 4 and the non-woven fabric 2 are fiber networks. intertwined. At this time, in the nonwoven fabric 2, the network-forming fibers I can maintain the fiber network even when subjected to high-pressure water flow, but the fiber space-expanding fibers II are forcibly forced downward due to the pressure of high-pressure water flow. One side, that is, the side opposite to the side overlapping the web of cotton fiber web 3' moves. That is, an uneven distribution is formed. Specifically, when the fiber space-expanding fiber II is composed of b) fibers, because b) the fibers are thin fibers and have few fusion bonding components, the thermal fusion bonding force between the b) fibers and the network-forming fibers I is weak, so that the two fibers The melt-bonded points are easily destroyed by the pressure of high-pressure water flow. The result is that b) the fibers are forced to move. On the other hand, when the fiber space expanding fibers II are composed of c) fibers, the c) fibers are forcibly moved by the pressure of the high-pressure water flow because they are not thermally fused with the network forming fibers I. c) When the fiber is composed of latently crimped fibers that have crimped, as described above, a part of the network forming fiber I enters the coil of the crimped latently crimped fiber, and the coil portion will elongate, so the potential The crimped fibers do not move excessively even when subjected to high pressure water flow. As a result, the movement of the latently crimped fibers is controlled, and as will be described later, the fiber space composed of the network-forming fibers I alone can be appropriately formed. That is, when using a latently crimped fiber with crimp as the fiber c), the latently crimped fiber moves due to the elongation of the coil part due to the action of the water flow, thereby appropriately forming the fiber space of the network-forming fiber I, and then As the coil is partially contracted, the potentially crimped fibers return to the position before the movement or a similar position, so that uneven distribution does not occur excessively. the

As a result of the movement of the fiber space-expanding fiber II, the portion vacated by the movement of the fiber space-expanding fiber II forms a fiber network composed of network-forming fibers I alone. That is, the fiber space in this part becomes larger than before receiving the pressure of the high-pressure water flow. In other words, the interfiber distance in the fiber space of this portion increases. The increased fiber space makes it easy for cotton fibers 4 to enter and interweave with the fiber network. It is extremely difficult to secure sufficient fiber spaces by constituting the nonwoven fabric 2 using only the network-forming fibers I without using the fiber space expanding fibers II. Therefore, in the present invention, by using the network-forming fibers I forming the fiber network and the fiber space expansion fibers II that can move under the pressure of high-pressure water flow, sufficient fiber space can be ensured, and the cotton fibers 4 can be fully inserted into the non-woven fabric 2 and make them fully intertwined. the

In this way, the cotton fiber layer 3 made of cotton fibers 4 is formed on one side of the nonwoven fabric, whereby the fiber sheet 1 is obtained. the

As mentioned above, in the present invention, two kinds of fibers are used as the fiber space expanding fibers II, one is a fiber that is moved by a water flow and is unevenly distributed, and the other is a latent crimped fiber that is crimped, although it will Moved by the water flow, but will return to near the original position, so there will be no large unevenly distributed fibers. Using the former type of fibers has the advantage that a capillary gradient can be formed on the fiber sheet 1 . The advantage of using the latter type of fiber is that there is less fiber shedding, and it can also exhibit stretchability on the fiber sheet. the

Next, another embodiment of the present invention will be described with reference to FIG. 4 . With regard to this embodiment, only the points of difference from the above-described embodiments will be described, and the detailed descriptions of the above-mentioned embodiments can be appropriately applied to places that are not particularly described. In addition, in FIG. 4, the same code|symbol is attached|subjected to the same member as FIG. the

As shown in FIG. 4, the fibrous sheet 10 of this embodiment is composed of a composite sheet in which cotton fiber layers 13, 13 are partially inserted into each surface of a nonwoven fabric 12 made of synthetic fibers. In the fibrous sheet 10 , the amount of the cotton fibers 4 gradually decreases from the side where the cotton fiber layers 13 , 13 are formed toward the center of the fibrous sheet 10 in the thickness direction. In addition, when viewed from the fiber sheet 1 as a whole, the amount of fibers increases from the side where the cotton fiber layers 13, 13 are formed toward the center in the thickness direction of the fiber sheet 10. That is, the distance between fibers gradually decreases from the side where the cotton fiber layers 13 , 13 are formed toward the center of the fiber sheet 10 in the thickness direction. As a result, the capillary force gradually increases from the side where the cotton fiber layers 13 , 13 are formed toward the center in the thickness direction of the fiber sheet 10 . That is, the capillary force creates a gradient. Therefore, the absorbency of liquid absorbed into the inside of the sheet from the sides where the cotton fiber layers 13, 13 are formed is enhanced, and the surface of the fibrous sheet 1 feels dry even when the fibrous sheet 1 touches liquid. the

Since the fiber sheet 10 of this embodiment has the cotton fiber layers 13 formed on both sides thereof, it can be used on either side to touch the skin. the

The present invention is not limited to the foregoing embodiments. For example, in the embodiment shown in Fig. 1, cotton fibers are not formed on the side surface where the cotton fiber layer 3 is not formed, but cotton fibers may also be formed on the side surface where the cotton fiber layer 3 is not formed. the

The fiber sheet of the present invention can prevent the clogging of the cotton fibers that tends to occur in conventional cotton sheets, and thus exhibits soft texture. In addition, the fiber sheet of the present invention has a capillary force gradient from the cotton fiber layer to the inside of the sheet, and has strong liquid absorption. Therefore, even if the fiber sheet is in contact with liquid, the surface of the cotton fiber layer will feel dry. Furthermore, the cotton fiber layer in the fiber sheet of the present invention has a higher tensile strength than a cotton sheet composed of cotton fibers of the same mass per unit area, so the cotton fiber layer can be set to a low unit area. quality. Setting the cotton fiber layer to a low mass per unit area is beneficial from the perspective of improving the softness of the cotton fiber layer. the

Claims (10)

1. A fibrous sheet comprising cotton fibers and two or more different synthetic fibers, two or more of which form a nonwoven fabric into which the cotton fibers enter Within and interwoven with the fiber network, a layer of cotton fibers is formed on one side of the nonwoven fabric in a state of partially entering the nonwoven fabric, two or more of said synthetic fibers comprising the following a) fibers and b) a combination of fibers or a) a combination of fibers and c) fibers, a) heat-melt adhesive fibers, b) heat-melt-adhesive fibers having a smaller fiber diameter than the heat-melt-adhesive fibers of a), c) there is no fiber fusion-bonded with the heat-melt-adhesive fiber of a), and the b) fiber or c) fiber is partial to the side where the cotton fiber layer is not formed, When two or more of said synthetic fibers comprise a combination of a) fibers and b) fibers, said fiber sheet is formed by a) between fibers, b) between fibers and a) fibers and b) fibers A fiber web of cotton fibers is superimposed on one side of the non-woven fabric melted and bonded, and a high-pressure water jet is sprayed from the fiber web side, When two or more of the synthetic fibers comprise a combination of a) fiber and c) fiber, the fiber sheet is one side of the nonwoven fabric formed by fusion bonding between the fibers of a) A web made of cotton fibers is superimposed on top of it, and a high-pressure water stream is sprayed from the side of the web. 2. The fibrous sheet according to claim 1, wherein the nonwoven fabric contains 30-70% by mass of a) fibers and 70-30% by mass of b) or c) fibers. 3. The fibrous sheet according to claim 1, wherein the amount of cotton fibers gradually decreases from the side where the cotton fiber layer is formed to the side where the cotton fiber layer is not formed. 4. The fibrous sheet according to claim 1, wherein the c) fibers are latently crimped fibers that are crimped. 5. The fibrous sheet according to claim 1, wherein the distance between fibers gradually decreases from the side where the cotton fiber layer is formed toward the center in the thickness direction of the fibrous sheet. 6. The fiber sheet according to claim 1, wherein the cotton fiber layer has a larger distance between fibers than a cotton sheet obtained by interlacing cotton fibers of the same type through water. 7. The manufacturing method of the fiber sheet according to claim 1, comprising a) fiber and b) fiber, and by fusion bonding between a) fiber, b) between fiber and a) fiber and b) fiber One side of the non-woven fabric formed, or on one side of the non-woven fabric that contains a) fiber and c) fiber and is formed by fusion bonding between a) fibers, the fiber web of cotton fiber is overlapped, from The fiber web side sprays high-pressure water flow to make the cotton fibers enter the fiber network of the non-woven fabric and make it interweave with the fiber network, and at the same time make the b) fibers or c) fibers in the non-woven fabric move to the non-woven fabric. Spin the other side of the fabric. 8. A fibrous sheet comprising cotton fibers and two or more different synthetic fibers, two or more of which form a nonwoven fabric into which the cotton fibers enter In and interwoven with the fiber network, cotton fiber layers are respectively formed on each side of the non-woven fabric in a state of partially entering the non-woven fabric, and two or more kinds of said synthetic fibers comprise the following a) a combination of fibers and b) fibers or a) fibers and c) fibers, a) heat-melt adhesive fibers, b) heat-melt-adhesive fibers having a smaller fiber diameter than the heat-melt-adhesive fibers of a), c) fibers that are not fusion bonded to the heat-melt-adhesive fibers of a), When two or more of said synthetic fibers comprise a combination of a) fibers and b) fibers, said fiber sheet is formed by a) between fibers, b) between fibers and a) fibers and b) fibers The fiber web of cotton fiber is superimposed on each surface of the non-woven fabric obtained by fusion bonding, and a high-pressure water jet is sprayed from the side of the fiber web to manufacture, When two or more of the synthetic fibers comprise a combination of a) fiber and c) fiber, the fiber sheet is formed by fusion bonding between the fibers of a) on each side of the nonwoven fabric A web made of cotton fibers is superimposed on top of it, and a high-pressure water stream is sprayed from the side of the web. 9. The fibrous sheet according to claim 8, wherein the amount of fibers gradually decreases from a side where each cotton fiber layer is formed toward a center in a thickness direction of the fibrous sheet. 10. An absorbent article comprising a liquid-permeable front sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent body disposed between the two sheets, wherein The fibrous sheet according to claim 1 or 8 as the top sheet.

Images